and mercury and uranium have been mined at eight or more sites in and around the calder ##a . other areas in the calder ##a were mined for ore ##s of anti ##mony , ce ##si ##um , and lithium . the trout creek mountains are semi @ - @ arid because they are in the eastern rain shadow of mountain ranges to the west . when moist air from the pacific ocean moves eastward over the oregon and california coastal ranges and the cascade range , most precipitation falls in those mountains before reaching the trout creek mountains . as a result , the average annual precipitation in the trout creek mountains is only 8 to 26 inches ( 200 to 660 mm ) per year ,
and mercury and uranium have been mined at eight or more sites in and around the caldera. other areas in the caldera were mined for ores of antimony, cesium, and lithium. the trout creek mountains are semi @ - @ arid because they are in the eastern rain shadow of mountain ranges to the west. when moist air from the pacific ocean moves eastward over the oregon and california coastal ranges and the cascade range, most precipitation falls in those mountains before reaching the trout creek mountains. as a result, the average annual precipitation in the trout creek mountains is only 8 to 26 inches ( 200 to 660 mm ) per year,